The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 2010
Filed:
Sep. 26, 2005
Kensaku Kagechi, Nara, JP;
Hisashi Saiga, Nara, JP;
Keisuke Iwasaki, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The object of the present invention is to provide an image encoding device and decoding device which allows the maximum compression rate to be achieved with a visually uniform level of picture quality. The present invention has a characteristic pixel extractorwhich encodes input images by small region unit in accordance with an irreversible compression method, decodes the encoded data which is created, and utilizes the input image and decoded image obtained after decoding to extract characteristic pixels, a characteristic distortion calculatorwhich utilizes characteristic pixels to calculate characteristic distortion of the decoded image in relation to the input image, and an encoding parameter controllerwhich controls parameter values determining the degree of data compression in line with the extent of characteristic distortion. The regions of picture quality of a visually uniform level thus obtained are all compressed using an image compression method with a high compression efficiency, thus allowing the maximum compression rate to be achieved.